JP5784761B2 - Magnetic removal device - Google Patents

Description

  The present invention relates to a magnetic substance removing device that removes a magnetic substance from a material by a magnetic force when a granular material is pneumatically transported.

  When manufacturing products using materials such as powder or granules, foreign materials such as metals may be mixed in the materials, and these foreign materials may cause problems with the manufacturing equipment or enter products. May become defective. For this reason, a magnetic substance removing device that removes a magnetic substance such as metal from the material by magnetic force is used. For example, it is described also in patent document 1.

  FIG. 5 is an explanatory diagram of an example of a conventional magnetic substance removing device. 5A is an elevation view, and FIG. 5B is a plan view. In the figure, 21 is an adsorbent, 22 is a storage container, 23 is an inlet pipe, 24 is an outlet pipe, and 25 is a granular material. In the conventional magnetic substance removing apparatus shown in FIG. 5, an inlet pipe portion 23 and an outlet pipe portion 24 are provided at opposing positions in the lower portion of the container 22. In addition, a plurality of adsorbers 21 that adsorb magnetic substances by magnetic force are accommodated inside the container 22.

  The particulate material 25 is pumped by air, for example, from the inlet tube portion 23 side, or is sucked from the outlet tube portion 24 side and conveyed, and is supplied from the inlet tube portion 23. The central axes of the inlet pipe portion 23 and the outlet pipe portion 24 coincide with each other and extend in the horizontal direction. On the other hand, the central axes of the plurality of adsorbers 21 are in the vertical direction, and when the granular material 25 supplied from the inlet pipe portion 23 passes between the adsorbents 21, it is mixed into the granular material 25. The magnetic substance is adsorbed on the surface of the adsorbent 21 by the magnetic force of the adsorbent 21. Thereby, the magnetic material is removed from the granular material 25. The granular material 25 from which the magnetic material has been removed is discharged from the outlet pipe portion 24 and conveyed to the next process.

  The cross-sectional area of the storage container 22 is set to be larger than the cross-sectional areas of the inlet pipe part 23 and the outlet pipe part 24, and the cross-sectional area of the inlet pipe part 23 and the outlet pipe part 24 increases as it approaches the storage container 22. It is getting bigger. As a result, the flow velocity of air in the storage container 22 is slower than when the granular material 25 is transported, and damage to the adsorbent 21 due to the collision of the granular material 25 with the adsorbent 21 can be reduced. Can extend the lifespan.

  FIG. 6 is an explanatory diagram of an example of a granular material stay in a conventional magnetic substance removing apparatus. It is good for the adsorbent 21 that the flow velocity of air in the storage container 22 is slow, but on the other hand, the particulate material 25 conveyed to the storage container 22 sinks and stays at the bottom of the storage container 22. Cause a malfunction. When the particulate material 25 sinks at the bottom of the container 22, the air flow for transport flows over the sinked particulate material 25, and the sedimented granular material 25 stays without being transported.

  An example of the state in which the granular material 25 stays is shown in FIG. As shown in FIG. 6, even when the inlet pipe portion 23 and the outlet pipe portion 24 are connected to the lower part of the storage container 22, the granular material 25 sunk in the bottom of the storage container 22 stays without being blown away by air. However, the air for conveyance flows through the upper part of the accumulated granular material 25. When the granular material 25 is intermittently conveyed, the granular material 25 sinks to the bottom when the conveyance is stopped.

  When the retained granular material 25 increases, the retained granular material 25 gradually covers the lower portion of the adsorbent 21. For this reason, there is a problem that the portion where the adsorbent 21 can adsorb the magnetic material is reduced, the performance of removing the magnetic material is lowered, and the original performance cannot be exhibited.

  To solve this problem, for example, it is conceivable to increase the air flow rate when conveying the granular material 25 to suppress the decrease in the flow rate in the storage container 22, but this only increases the damage to the adsorbent 21. In addition, the wear caused by the collision of the granular material 25 against the wall of the pipe line at the bent part of the pipe line for conveying the granular material 25 becomes severe, and the risk of causing the generation or breakage of foreign matters increases.

  For example, Patent Document 2 describes a configuration in which compressed air is sent from the bottom surface of the storage container to prevent the material from staying at the bottom. In the case of this configuration, a powder material that soars in the air is blown up with air even if it can sink to the bottom, and retention is prevented. However, in the case of granular materials that are larger and heavier than powder, it is difficult to blow up with air from the bottom. May result.

Japanese Patent Laid-Open No. 11-138045 Japanese Patent No. 35403939

  The present invention has been made in view of the above-described circumstances, and provides a magnetic substance removing device that can reduce the residual particulate material in the container and efficiently remove the magnetic substance contained in the granular material. It is intended.

  The present invention includes a magnetic substance adsorbing unit that adsorbs a magnetic substance in a granular material by a magnetic force, an accommodating unit that accommodates the magnetic substance adsorbing unit, and the granular material that is provided on the upper part of the accommodating unit and is sent by air. An inlet pipe portion to be supplied; an outlet pipe portion provided in the housing means for discharging the granular material; and an air hole provided in a lower portion of the housing means; Turbulent flow is generated in the accommodating means by the flow of air from the air and the flow of air changed in direction upon the particulate material introduced from the air holes and staying at the bottom of the accommodating means, and the accommodating means is caused by the turbulent flow. The magnetic material removing apparatus is characterized in that the granular material staying at the bottom of the material is wound up and moved to the outlet pipe.

  The accommodating means may have a cross-sectional shape that is constricted in the planar direction and the vertical direction toward the inlet pipe. Moreover, the accommodating means may have a cross-sectional shape portion narrowed in the plane direction toward the outlet pipe portion. Furthermore, the accommodating means may have a cross-sectional area wider than the cross-sectional area of the outlet pipe portion.

  According to the present invention, the magnetic material is adsorbed and removed by the magnetic material adsorbing means while the particulate material is supplied from the inlet pipe portion and is air-fed to the outlet pipe portion. Then, turbulent flow (vortex) is generated inside by the air from the lower part flowing in from the air holes, and the granular material staying at the bottom of the accommodating means is wound up by this turbulent flow and moves to the outlet pipe. Thereby, the residue of the granular material in the storage container can be reduced. Also, the magnetic material adsorbing means is not buried by the granular material staying in the storage means, and the chance of the granular material contacting the magnetic material adsorbing means by turbulent flow increases, and the magnetic material contained in the granular material is efficiently removed. There is an effect that can be done.

  In addition, since the accommodating means has a cross-sectional portion that is narrowed in the plane direction and the vertical direction toward the inlet pipe portion, the supplied granular material spreads in the accommodating means, and the granular material widely hits the magnetic substance adsorption means. Thus, the magnetic substance can be removed efficiently.

  Furthermore, the accommodating means has a cross-sectional shape that is constricted in the plane direction toward the outlet pipe portion, thereby increasing the flow rate of air from the accommodating means to the outlet pipe portion, and efficiently generating the granular material in the accommodating means. Can be sent to the outlet pipe.

  Furthermore, since the storage means has a cross-sectional area wider than the cross-sectional area of the outlet pipe portion, the flow rate of air in the storage means can be reduced to reduce damage to the magnetic substance adsorption means.

It is a block diagram which shows one Embodiment of this invention. It is explanatory drawing of an example of the operation | movement in one Embodiment of this invention. It is a block diagram which shows the modification of one Embodiment of this invention. It is a block diagram which shows another modification of one Embodiment of this invention. It is explanatory drawing of an example of the conventional magnetic substance removal apparatus. It is explanatory drawing of an example of the staying body of the granular material in the conventional magnetic substance removal apparatus.

  FIG. 1 is a configuration diagram showing an embodiment of the present invention. 1A is an elevation view, FIG. 1B is a plan view, and FIG. 1C is a cross-sectional view taken along line a-a ′ in FIG. In the figure, 1 is an adsorbent, 2 is a container, 3 is an inlet pipe, 4 is an outlet pipe, 5 is an air hole, 6 is an inlet side throttle, and 7 is an outlet side throttle.

  The storage container 2 stores a plurality of adsorbents 1. As this adsorbent 1, it is preferable to use a plurality of permanent magnets arranged in a cylindrical body with the same poles facing each other and having a gap. Or an electromagnet etc. may be sufficient. The adsorbent 1 can adsorb and remove magnetic substances from the granular material supplied to the container 2 by this magnetic force. In this example, seven adsorbents 1 are provided, and FIG. 1C shows three adsorbents 1 provided in a cross section. Of course, the shape, number, and arrangement of the adsorbents 1 are not limited to this example, and are determined at the time of design. In addition, it is good for the adsorption body 1 to be comprised from the container 2 so that cleaning and replacement | exchange are possible.

  Connected to the container 2 are an inlet pipe part 3 for supplying the granular material into the container 2 and an outlet pipe part 4 for discharging the supplied granular material to the outside. The inlet pipe part 3 is connected to the upper part of the container 2. An inlet-side restricting portion 6 having a cross-sectional shape that is constricted in the plane direction and the vertical direction toward the inlet tube portion 3 may be provided at a connection portion between the inlet tube portion 3 and the container 2. Moreover, the exit pipe part 4 is connected to the lower part of the storage container 2 in this example. An outlet-side restricting portion 7 having a cross-sectional shape that is constricted in the plane direction toward the outlet pipe portion 4 may be provided at a connection portion between the outlet pipe portion 4 and the container 2. The container 2 may have a cross-sectional area wider than that of the outlet pipe portion 4.

  Furthermore, an air hole 5 is provided in a lower portion of the container 2 at a position facing the outlet pipe portion 4 in a plan view. When the granular material is conveyed by air, the container 2 Air is introduced into the interior. The size of the air hole 5 may be determined at the time of designing in consideration of the amount of air introduced into the container 2. When the diameter is larger than that of the granular material, a filter may be provided so that the granular material does not leak out. In addition to or in combination with this filter, a filter may be provided to prevent foreign matters such as dust from entering from outside. In addition to natural intake air, compressed air may be supplied. In that case, what is necessary is just to adjust the air quantity introduced with a pressure regulating valve or an air regulating valve.

  FIG. 2 is an explanatory diagram of an example of the operation according to the embodiment of the present invention. In the figure, 8 is a granular material. Here, it assumes that it is a resin pellet as a granular material, and it demonstrates as what is air-fed. The resin pellets are generally granular with a size of about 3 to 5 mm. Of course, it goes without saying that the present invention is not limited to such granular materials.

  A granular material such as a resin pellet does not float or scatter in the air like a powder material due to its own weight, and flows so as to crawl the pipeline or the bottom of the container 2 during air transportation. . In addition, it is necessary to increase the air flow rate from the weight. Therefore, for example, in the conventional magnetic substance removing apparatus shown in FIG. 5, only a part of the adsorbent 21 is used for removing the magnetic substance. Further, since the flow velocity is high, a sufficient effect of removing the magnetic substance cannot be obtained, and the damage to the adsorbent 21 is severe. Further, in the case of intermittent air feeding, granular material such as resin pellets stays at the bottom when the movement is stopped, but a large load is applied when air feeding is started from this state. In order to cope with the load at the start of the air transport, if the air flow rate is increased too much, not only the adsorbent 21 but also the bent portion of the pipe will cause collision of the particulate material and frictional resistance, and foreign matter due to damage to the pipe will be generated. Occurrence occurred. Further, even when the air transport was started, the air flow for air transport only flowed monotonously on the upper part of the staying resin pellets, and the staying resin pellets were not moved to the outlet pipe part 4.

  In the configuration according to the embodiment of the present invention shown in FIG. 1, granular material 8 such as resin pellets is supplied from the inlet pipe portion 3 to the container 2. Here, it is assumed that the air is intermittently sent by suction from the outlet pipe portion 4 side. The granular material 8 supplied from the inlet pipe part 3 moves in the container 2 and proceeds to the outlet pipe part 4. On the way, the particulate material 8 collides with the adsorbent 1, and at that time, the magnetic substance is adsorbed on the surface of the adsorbent 1 by magnetic force and removed. Therefore, the granular material 8 from which the magnetic material has been removed by the adsorbent 1 is sent to the outlet pipe portion 4.

  The inlet pipe part 3 is connected to the upper part of the container 2, and the granular material 8 that has been air-fed from the inlet pipe part 3 falls from the top to the bottom of the container 2 due to its own weight and the flow of air, It goes to the outlet pipe part 4 provided in the lower part of the storage container 2. In the middle of this, the granular material 8 collides with the adsorbent 1, but as a conveying path of the granular material 8, the granular material 8 flies diagonally in the container 2, and the granular material 8 comes into contact with the adsorbent 1. Is increasing. Moreover, the movement path in the container 2 also varies due to the dispersion of the granular material 8, and the granular material 8 collides as a whole from the upper part to the lower part of the adsorbent 1 provided in the container 2. Thereby, the magnetic substance can be adsorbed and removed from the supplied granular material using the entire adsorbent 1.

  In addition, an inlet side throttle portion 6 is provided at a connection portion of the storage container 2 with the inlet pipe portion 3. The granular material 8 that has been air-fed from the inlet pipe portion 3 is further separated by the inlet-side throttle portion 6. Also by this inlet side restricting portion 6, the granular material 8 can be widely collided with the entire adsorbent 1, and the magnetic substance contained in the granular material 8 can be adsorbed and removed efficiently.

  The container 2 has a cross-sectional area from the inlet pipe portion 3 that is widened by the inlet-side throttle portion 6, thereby gradually reducing the flow velocity of air in the inlet pipe portion 3. This also disperses the granular material 8, but further weakens the force with which the granular material 8 collides with the adsorbent 1. As described above, in the case of intermittent air feeding, it is necessary to secure a certain flow rate in order to counter the load when starting the air feeding from the stopped state. By gradually widening the cross-sectional area by the inlet side restricting portion 6, the flow velocity of the air is reduced in the storage container 2. Therefore, the force with which the particulate material 8 collides with the adsorbent 1 is weakened, and even when the flow velocity of the air in the outlet pipe 4 is high, the wear of the adsorbent 1 can be reduced and the life of the adsorbent 1 can be extended. it can.

  In addition, an outlet-side restricting portion 7 having a cross-sectional shape that is constricted in the plane direction toward the outlet pipe portion 4 is provided at a connection portion of the storage container 2 with the outlet pipe portion 4. The outlet-side restricting portion 7 gradually increases the flow velocity of the air that has been slowed down in the container 2 to the flow velocity in the outlet pipe portion 4. Thereby, the granular material 8 in the storage container 2 can be efficiently sent to the outlet pipe part 4. The granular material 8 such as resin pellets flows so as to crawl the pipe and the bottom of the container 2 during the air transportation. Therefore, the outlet pipe portion 4 is preferably provided at the lower part of the container 2. Further, if the outlet pipe portion 4 is provided in the lower part of the storage container 2, the granular material 8 in which the granular material 8 stays at the bottom of the storage container 2 can be easily fed to the outlet pipe section 4, and the granular material 8 is discharged more efficiently. It can be sent to the pipe part 4.

  As described above, the flow velocity of air is made slower in the container 2. As a result, damage to the adsorbent 1 is reduced, but the granular material 8 tends to stay at the bottom of the container 2. Furthermore, in the case of intermittently air-feeding, the granular material 8 stays at the bottom of the container 2 while the conveyance is stopped, and the granular material 8 that stays still does not move even when air-feeding is started. Also occurs. In the embodiment of the present invention shown in FIG. 1, the air hole 5 is provided in the lower portion of the container 2 at a position facing the outlet pipe portion 4 in plan view against the retention of the granular material 8. It corresponds.

  That is, as shown by the broken line in FIG. 2A, air flows from the inlet pipe portion 3 into the housing container 2 and air also flows from the air holes 5 with respect to suction from the outlet pipe portion 4 side. To do. Since the air holes 5 are provided in the lower part of the container 2, the air flowing into the container 2 from the air holes 5 hits the granular material 8 staying at the bottom of the container 2, and the granular material 8 is discharged to the outlet pipe. While pushing to the part 4, the flow direction is changed upward. On the other hand, as shown in FIG. 1C, the air flowing in from the inlet pipe portion 3 becomes a wall of the adsorbent body 1, and a part of the air flows through the adsorbent body 1, but a part of the air hits the adsorbent body 1 and the airflow is disturbed. If there is only airflow flowing in from the inlet pipe section 3, the turbulent airflow is pushed away by the airflow passing through the adsorbent 1 and becomes a steady airflow toward the outlet pipe section 4. However, when an air flow that is turbulent by the adsorbent 1 and flows upward from the air holes 5 and hits the particulate material 8, a spiral turbulent flow is generated in the container 2. Even the granular material 8 that does not rise in the air flow used in normal air transportation is wound up by this turbulent flow and moved to the outlet pipe portion 4 by a part of the air flow toward the outlet pipe portion 4. Accordingly, the granular material 8 staying at the bottom of the container 2 is wound up, travels to the output pipe section 4 and is discharged from the output pipe section 4.

  In addition, even if the granular material 8 does not stay, this turbulent flow is generated by the air that has flowed in through the inlet pipe portion 3 and changed its flow by the adsorbent 1 and the air that has flowed in through the air holes 5. The granular material 8 sent from the inlet pipe portion 3 is agitated to increase the chance of coming into contact with the adsorbent 1, and the magnetic material can be better removed from the granular material by adsorption. Further, the adsorbent 1 is not buried with the retained granular material 8, and the magnetic substance can be efficiently removed using the entire adsorbent 1.

  In this example, an air hole 5 is provided at a position facing the output pipe portion 4. As a result, the particulate material 8 soared by the turbulent flow can also be efficiently moved in the direction from the air hole 5 and the inlet pipe portion 3 to the outlet pipe portion 4. Therefore, as shown in FIG. 2 (B), the portion in which the granular material 8 stays at the bottom of the storage container 2 does not occur during the empty feeding, and the granular material 8 can be satisfactorily fed by air.

  In the magnetic substance removing apparatus according to the embodiment of the present invention shown in FIG. 1, the magnetic substance removing apparatus is tilted by slightly raising the inlet pipe portion 3 side or slightly lowering the outlet pipe portion 4 side. It is good to attach. Thereby, a granular material can be thrown in from a higher position, and a granular material can be sent to the exit pipe part 4 in a lower position. Therefore, the retention of the particulate material can be reduced, and the contact of the particulate material with the adsorbent 1 can be promoted. Further, since the granular material moves to the outlet pipe portion 4 existing at a low position, it becomes possible to reduce the amount of air from the air hole 5 causing the turbulent flow, and the air sucked from the outlet pipe portion 4 The amount of damage can be reduced by reducing the amount.

  In addition, in the conventional magnetic substance removing device, for example, there are examples provided in the charging hopper, the stock tank, and the kneading tank, but when confirming the adsorption of the magnetic substance to the adsorbent or cleaning the adsorbent In this case, work to open and close the tank occurs, and it becomes work at a high place, so that workability is poor. In the configuration shown in the embodiment of the present invention, the magnetic substance removing device can be installed in the middle of conveying the granular material in the horizontal direction. In the case of horizontal conveyance, the pipeline can be installed at a low position, for example, near the floor. Therefore, it is possible to improve the workability when performing the work of confirming the adsorption of the magnetic substance to the adsorbent and the operation of cleaning the adsorbent.

  FIG. 3 is a configuration diagram showing a modification of the embodiment of the present invention. In this modification, a configuration in which the inlet side throttle portion 6 and the outlet side throttle portion 7 are not provided in the configuration shown in FIG. 1 is shown. In this configuration, the granular material 8 is dispersed by the inlet-side throttle portion 6 and the function of gradually reducing the air flow rate, or the function of efficiently sending the granular material 8 to the outlet pipe portion 4 by the outlet-side throttle portion 7. However, the function of moving the granular material 8 staying at the bottom of the container 2 by the air introduced from the air hole 5 can be obtained as it is.

  Of course, a configuration in which the inlet side throttle portion 6 is provided but the outlet side throttle portion 7 is not provided, or a configuration in which the inlet side throttle portion 6 is not provided but the outlet side throttle portion 7 is provided may be employed.

  FIG. 4 is a configuration diagram showing another modification of the embodiment of the present invention. In this modification, the example which provided the adsorption body 1 in the horizontal direction is shown. Even in such a configuration, the granular material 8 is supplied from the inlet pipe portion 3 connected to the upper portion of the container 2, and when the supplied granular material 8 contacts the adsorbent 1, the magnetic substance is adsorbed and removed by magnetic force. Thus, it is discharged to the outlet pipe portion 4.

  In this configuration, the particulate material 8 tends to stay in the lower portion of the inlet pipe portion 3, which is a position facing the outlet pipe portion 4 of the storage container 2 in a plan view. Therefore, the air hole 5 is provided in the lower part of this position. When suction is performed from the outlet pipe portion 4 side, air flows from the inlet pipe portion 3 into the storage container 2 and air also flows from the air holes 5. Also in this case, a vortex-like turbulent flow is generated by the air flowing in from the inlet pipe portion 3 and the air flowing in from the air hole 5. When there is no air hole 5, only air for air transport flows on the surface of the retained granular material 8, and the retained granular material 8 does not move. In this configuration, turbulent flow is generated in the storage container 2 by the air flowing in from the air holes 5, and the turbulent flow causes the granular material 8 staying at the bottom of the storage container 2 to rise and move to the outlet pipe section 5. The granular material 8 can be discharged from the output pipe portion 4. As a result, the granular material 8 does not stay in the bottom of the container 2 during the air transport, and the adsorbent 1 is not buried with the retained granular material 8, and the magnetic material is efficiently removed using the entire adsorbent 1. can do.

  As mentioned above, while showing the best form as one Embodiment of the magnetic substance removal apparatus of this invention, the some modification was shown. However, the configuration illustrated above is merely an example, and various modifications can be made without departing from the scope of the invention.

  DESCRIPTION OF SYMBOLS 1 ... Adsorbent body, 2 ... Container, 3 ... Inlet pipe part, 4 ... Outlet pipe part, 5 ... Air hole, 6 ... Inlet side restricting part, 7 ... Outlet side restricting part, 8 ... Granular material, 21 ... Adsorber 22 ... Container, 23 ... Inlet pipe part, 24 ... Outlet pipe part, 25 ... Granular material.

Claims (4)

  Magnetic substance adsorbing means for adsorbing magnetic substances in the granular material by magnetic force, accommodating means for accommodating the magnetic substance adsorbing means, and an inlet provided at the upper part of the accommodating means and supplied with the granular material that has been fed by air A pipe section, an outlet pipe section provided in the housing means for discharging the particulate material, and an air hole provided in a lower portion of the housing means, and air from the inlet pipe section at the time of air transportation A turbulent flow is generated in the accommodating means by the flow and the air flow changed in direction upon the particulate material introduced from the air hole and staying at the bottom of the accommodating means, and the turbulent flow causes the turbulent flow to stay at the bottom of the accommodating means. The magnetic material removing apparatus, wherein the granular material is wound up and moved to the outlet pipe portion.   2. The magnetic substance removing device according to claim 1, wherein the accommodating means has a cross-sectional shape portion that is narrowed in a plane direction and a vertical direction toward the inlet pipe portion.   The magnetic substance removing apparatus according to claim 1, wherein the housing means has a cross-sectional shape portion that is narrowed in a planar direction toward the outlet pipe portion.   4. The magnetic substance removing device according to claim 1, wherein the housing means has a cross-sectional area wider than a cross-sectional area of the outlet pipe portion. 5.

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